We report the diffusion characteristics of water vapor through two different porous media, viz., membrane electrode assembly (MEA) and gas diffusion layer (GDL) in a nonoperational fuel cell. Tunable diode laser absorption spectroscopy (TDLAS) was employed for measuring water vapor concentration in the test channel. Effects of the membrane pore size and the inlet humidity on the water vapor transport are quantified through mass flux and diffusion coefficient. Water vapor transport rate is found to be higher for GDL than for MEA. The flexibility and wide range of application of TDLAS in a fuel cell setup is demonstrated through experiments with a stagnant flow field on the dry side.
Experimental Analysis of Water Vapor Diffusion Through Porous Membranes in a Proton Exchange Membrane Fuel Cell
Contributed by the Heat Transfer of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 30, 2014; final manuscript received April 29, 2015; published online August 11, 2015. Assoc. Editor: P. K. Das.
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Kumar Bansal, L., Deepu, P., and Basu, S. (August 11, 2015). "Experimental Analysis of Water Vapor Diffusion Through Porous Membranes in a Proton Exchange Membrane Fuel Cell." ASME. J. Heat Transfer. December 2015; 137(12): 121005. https://doi.org/10.1115/1.4030921
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